Focus adjustment for lamps.



L. T.GRANDY. FOCUS ADJUSTMENT FOR LAMPS.

APPLICATION FILED MAR. 15. 1915- Patented Nov. 9, 1915.

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LEV ETT 1. GRANDY, OF DETROIT, MICHIGAN, ASSIGNOR TO C. M. HALL LAMP COMPANY,. OF DETROIT, MICHIGAN. CORPORATIO1\T OF MICHIGAN.

FOCUS ADJUSTMENT FOR LAMPS.

Specification'of Letters Patent.

rattan-ea no". a. 1915.

To all whom 1'5 may concern..-

Be 1t known that I. Lnvnr'r T. GnAxnY, a

citizen of the United States of America. residing at Detroit, in the county of llayne and State of Michigan. have invented certain new and useful Improvements in Focus Adjustment for Lamps. of which the following is a specification. reference being had therein to. the accompanying drawings.

The. invention relates to focus adjusting means for headlights and has. for its object the obtaining of a simplified construction and one which is easy to manipulate.

In'the drawings: Figure 1 is a perspective view of a lamp socket provided with my improved focus adjustment; F 2 is a longitudinal section therethrough: and Fig. 3 is an end elevation. i

A is the reflector. preferably of the usual parabolic form and B is the tubular rearward extension for receiving the lamp" socket t. This socket C may be of any suitable construction adapted for the detachable engagement therewith of a lamp. such as l). and as shown the lamp is engaged and locked in the socket by means of pins D engaging slots E having a locking notch F. Any suitable means for resiliently holding the pins 1) in the locking notches F may be used. but as shown the electrical contacts G for cooperation with the lamp con-- tacts H are resiliently yieldable;

To provide a ready. means for adjusting.

. the. lamp longitudinallyfor focusing. I have provided upon the socket and the tubular holder a notched or serrated member upon the one and a detent upon the other so constructed as to be disengageable by a rocking or lateral movement of the lamp socket in the tube B. As specifically shown the socket C is in the form of a cylinder struck up from a sheet metal blank and having a radially, outwardly and longitudinally. ex

from this movement by resilientlv yield shoe )I. which is connected to the tube B. H by resilient wire loops X. and normallvho presses the socket ("against the imperforate portion of the tube B.

ll'iththe construction lamp bulb I) may b readily engaged or disengaged from the socket C by a longitudinal and rotar v movement. In zu-conn'ilishing this the tension of the resilient .vicldabli contacts G must be overcome. but inasmuch as the socket C is locked by the serrated flange J engaging the detent L. said socket will be held from displacement. ll'hcu. however. it is desired to longitlnlinallv adjust the socket. a slight tilting'in the tube B will disengage the serrated flange I from the detent. permitting inward or outward longitudinal adjustment.

The device as above described is one which is exceedingly simple to-manufzn'ture. while the manipulation both in engaging the lamp bulb and in adjusting for focus is also easily performed.

hat I claim as my invention is '1. The combination with a lamp socket and a holder therefor-.of a longitudinallyextending notched or serrated.member upon the one engaging a .detent upon the other. and means yieldably holding said serrated ,member and detent in engagement. permitting of lateral bodily movement of the socket for disengagement.

l. The combination with a lamp socket. of a holder for said socket permitting longitudinal adjustment thereof. and means for .locking said socket in different positions of adjustment. disengageable by a lateral bodilv movement of the socket.

as described. the

1 5. The combination with a lamp socket having a longitudinally-extending serrated flange thereon, of a holder for said socket longitudinally slotted for the reception of said flange and having a detent for engaging the serrations of said flange, the opposite side of said holder being cut to permit of lateral movement of said socket for disengagement from said detent, and-a resiliently pressed means for normally holding said socket in position for locking of said detent.

6.-The combination with a lamp socket having a longitudinally-extending notched or serrated flange, of a holder for said socket slotted for the passage of said flange, and cut away on the opposite side from said slot to permit of the lateral movement or tilting of said socket, a transversely-extending flange on said holder also cut away for said longitudinal flange and having a detent for engaging the serrations of said longitudinal flange, and a resiliently pressed means for yieldably holding said socket with the serrated flange thereof in looking engagement with said detent.

7. The combination with a lamp socket, of

a holder in which said socket is longitudi- "nally ad ustable, means for locking said socket in different positions of longitudinal adjustment in said holder, said locking means being disengageable by a lateral bodily movement of the socket in said holder, means for resiliently and yieldably holding said socket from lateral bodily movement, a lamp having a locking engagement with said socket, operable by a longitudinal and rotary movement of the lamp, and means for yieldably opposing the longitudinal movement of said lamp in said socket to hold the same in the locked position.

A ,8. The combination 'with a lamp sockethaving alongitudinally-extending notched or serrated flange, of a tubular holder for said socket longitudinally slotted for said flange and cut away on the opposite side to permit of a lateral movement of said socket, a transversely-extending flange on said holder slotted for the passage of said longitudinal flange and having a detent. for en gaging the serrations thereof, a shoe for engaging said socket in the cutaway portion of said holder, and resilient means for connecting said shoe with the imperforate portion of the holder to resist lateral movement of said socket. 4

9. The combination with a lamp socket provided with a radially, outwardly and longitudinally notched flange, of a holder for said socket having a detent engageable with the notches of said flange, and means for yieldably holding said .detent in engagement with said notched flangefpermitting of a tilting movement of the socket for disengagement.

In testimony whereof I aflix my signature in presence of two witnesses.

LEVETT T..GRANDY. I lVitnesses:

TILLIAM F. AUKLAM, HERBERT APPELBAUM. 

